Research Of QPSK Wireless Communication Technology In DC/DC Parallel Current System

With the development of modern communication technologies and power systems,wireless network controlled studies of power electronics system are being conducted.Data transmission over wireless communication technology to control parallel DC/DC system is a cross-disciplinary integration between wireless communications and power electronics.With the deepening research of DC/DC distributed power systems,communications technology being developed and it has been widely used in the power electronics industry.The communication cable interconnection can increase the physical connection of DC/DC parallel system, make it more complex and limit the space for distributed power applications. For DC/DC Parallel System's characteristics of high-frequency control information flow,small single transfer amount, a large amount of data transfer and the thinking of wireless communications technology was used in high-speed power electronic system,QPSK modulation and demodulation was selected.Digital communication circuit with FPGA were selected in this paper.This method can increase the power density and improve the reliability, transfer rate of wireless communication.First, this paper describes the principles and control methods of DC/DC parallel current system, analyzes the advantages of QPSK modulation and demodulation technology, select the QPSK communication system and study its design principles and key technologies.Secondly, the design methods of modern digital systems and the basic principles and processes of FPGA design are studied.Altera's software platform QuartusII is used in QPSK communication system's design and simulation, the simulation results of the some modules are given.Finally,experiment platform based on wireless data transmission chip FPGA Stratix II family is build by studying the wireless transmission system's main hardware modules, such as a parallel interface module, orthogonal conversion module, the vibration chip modules.Further study proposed optimization of feasibility programs to achieve the current sharing system by wireless data transmission.The experimental results show that, QPSK wireless communication system based on FPGA can meet the communication requirements of DC/DC parallel flow system. There is a significant improvement on the transmission rate and reliability, the application in the field of power electronics is feasible. There is room for further optimization of the wireless communication system after the study of the system's problems.